Deformation and fracture of cylindrical tube under inside-explosive loading

Based on the classical thermo-viscoplastic constitutive relations, a new and uncoupled constitutive relation was proposed, which can describe the thermal softening, work hardening and strain rate hardening effects more exactly. For 35CrMnSiA steel, using Hopkinson bar stress-strain were measured under different high strain rates and the constants for the new constitutive equation were fitted. Combined with FENG Jia-po's damage evolution equation, the radial expand history and the radial profile function, a self-contained governing equation system was established, with which the expanding and fracture problem of a cylindrical tube under inside-explosive loading was computed. A satisfactory agreement between the computation and the experiments is obtained.